SSZ-101 Molecular Sieve Synthesis Using Structure Directing Agents
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Solution Overview
Problem
There is a continuous need for new molecular sieves with desirable properties for gas separation and hydrocarbon conversion reactions, as existing molecular sieves lack enhanced selectivities and novel internal pore architectures.
Innovation Solution
A new crystalline molecular sieve, SSZ-101, is developed using a N-cyclohexylmethyl-N-ethylpiperidinium cation as a structure directing agent, with specific mole ratios of oxides and elements, and prepared through a method involving a reaction mixture subjected to crystallization conditions, allowing for the formation of crystals with unique X-ray diffraction patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new molecular sieves with novel internal pore architectures are developed, then selectivity for gas separation and hydrocarbon conversion is improved, but the complexity of synthesis and characterization increases
Solution Approach 1:
The patent employs structure directing agents (SDAs) as intermediaries to guide the self-assembly of molecular sieve frameworks. These organic cations act as templates that direct the formation of specific pore architectures during hydrothermal synthesis, enabling the creation of novel structures with enhanced selectivity while managing synthesis complexity through template-directed self-organization
Solution Approach 2:
The patent systematically varies synthesis parameters including SDA structure, gel composition ratios (SiO2/Al2O3, SiO2/B2O3), pH, temperature, and crystallization time to optimize the formation of new molecular sieve structures. By controlling these parameters, the research achieves novel pore architectures with improved selectivity for specific applications
2Reliability
If molecular sieves are designed for specific applications like gas separation and drying, then performance in target applications is improved, but the versatility across different applications may be reduced
Solution Approach 1:
The patent develops molecular sieves with tunable properties that can serve multiple functions. By adjusting the framework composition (silicon-to-aluminum ratio, boron content) and pore structure through SDA selection, the same base structure can be optimized for different applications including gas separation, drying, hydrocarbon conversion, and pollution control, achieving both specialized performance and broad versatility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
SSZ-101 exhibits enhanced selectivities and is useful as an adsorbent for gas separations, catalyst for converting oxygenates to olefins, and effective in reducing nitrogen oxides, making it suitable for various industrial applications including combustion engine pollution control.
Implementation Method 1
the molecular sieve comprising a N-cyclohexylmethyl-N-ethylpiperidinium cation as a structure directing agent
Implementation Method 2
subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the molecular sieve
Implementation Method 3
having, in its as-synthesized form, the X-ray diffraction lines of Table 5
Data Source
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AI summary
A new crystalline molecular sieve designated SSZ-101 is disclosed. SSZ-101 is synthesized using a N-cyclohexylmethyl-N-ethylpiperidinium cation as a structure directing agent.